tree 6c0ef338312686c0e92fc8f950ecc98ff8be8f9a
parent 382a6652e91b34d5480cfc0ed840c196650493d4
author Robert Hancock <hancockr@shaw.ca> 1170721563 -0800
committer Jeff Garzik <jeff@garzik.org> 1171060779 -0500

sata_nv: wait for response on entering/leaving ADMA mode

Update sata_nv to wait for the controller to indicate via the status
register that it has entered the requested state when switching between
ADMA mode and register mode.  This issue came up recently when debugging
some problems with cache flush command timeouts and while it didn't appear
to fix that problem, this is something we should likely be doing in any
case.

Signed-off-by: Robert Hancock <hancockr@shaw.ca>
Cc: Tejun Heo <htejun@gmail.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>